Piston for internal-combustion engines



A t-i130, 1929. H, PRATT 1,711,425

PISTON FOR INTERNAL COMBUSTION ENGINES Filed Aug. l, 1927 Fig.4. d

INVENWR.

Patented Apr; 30, 1929.

PATENT OFFICE.

HUGH PRATT, OF CHESTER, ENGLAND.

-1IS'1ON non m'rnnnnncomnus'rron ENGINES.

Application filed Au'gust 1,'1927, Serial No. 209,841, and in Great Britain September 21, 1926.

Fig. 2 is a vertical section on line 2-2 .Fig. 1.

Fig. 3 is a transverse section on line 3u3 Fig. 1.

Fig. 4 isa perspective-view of the piston head with the gudgeon pin bosses depending therefrom.

Fig. 5 is a perspective View partly in section ofthe skirt.

The piston head A is constructed with two depending arms or extensions B diametrically opposite one another and which form or carry the bosses b for the gudgeon pin. The

lower ends of the arms or-extensions B are.

provided with brackets orfeet b which are machined on their peripheral surfaces so that they are true and concentric with the machined face of the head A.

The feet I; are provided with T slots 1) to receive the heads of the bolts d by which the skirt D is aflixed to the feet I). The skirt D isprovided with two integral flanges d which register with the underside of the feet band through which the bolts d project. The skirt D is provided with two integral flanges (l which register with the underside of the feet I) and through which the bolts cl 'project.

The skirt D is also provided with an integral ring d which registers with the machined peripheral faces of the feet I). By this construction the skirt may be machined all over both internally and externally and the skirt wlll always register with the piston head.

, The skirt D extends upwards beyond the gudgeon pin bosses b so'that the ends of the gudgeon pin will be contained within the skirt and the cylinder wallswill be protected from the possibility of rubbing bythe gudgeon pins.

Moreover by this construction the piston headmay be formed from suitable-material for the dissipation of heat whilst the skirt may be made from suitable material from the point of View of expansion and friction. Also the construction is free from distortion by unequal expansion owing to the uniformity in section of the skirt and the flexibility of the extension B.

. What I claim as my invention and desire to protect by Letters Patent is 1. In a piston of-the type'referred to the combination! with. the piston head of extensions depending therefrom, gudgeon pin bosses formed in said extensions, T headed bolts arranged in T slots in the extens'ionsand a skirt portion held in position by said bolts.

2. In a piston of the type referred to the combination with the piston head of extensions depending therefrom, gudgeon pin bosses formed in said extensions, Theaded bolts arranged in T slots in the extensions, a skirt portion held in position 'by said bolts, and flanges on said skirt portion to register with the underside of the extensions.

3. In a piston of the type referred to the combination with the piston head of extensions depending therefrom, gudgeon pin bosses formed in said extensions, T headed bolts arranged in T slots in the extensions, a skirt portionheld in position by said bolts, flanges on said skirt portion to register with the underside of the extensiona'and a ring on the skirt portion to register with machined faces inthe extensions.

In testimony whereof I have hereunto. set 00 m hand.

y HUGH PRATT. 

